attribute vec4 aPosition;
uniform mat4 vMatrix;
attribute vec2 vCoordinate;
varying vec2 aCoordinate;
varying vec4 glPosition;

varying vec4 aPos;//变换前的顶点坐标
void main(){
    aPos=aPosition;
    glPosition=vMatrix*aPosition;
    gl_Position =glPosition;
    aCoordinate=vCoordinate;
}